RecyclerView is not showing in Activity

RecyclerView is not showing in Activity - java

I have a NewsDetailsActivity file that is displaying some news details. On top of the news details I want to display some cardview in a recyclerview. The recyclerView is not showing up but the worse part is that another recyclerview (that I have in the MainActivity is showing up in my NewsDetailsActivity like if If I am calling some id from my NewsDetailsActivity.
The only thing I want is to display some information on the top of the news details using the the recyclerview id my_recycler_view_coin_details
NewsDetailsActivity
package com.noticripto.activities;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.noticripto.APIClientCoin;
import com.noticripto.adapters.CryptoListAdapter;
import android.content.Intent;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import com.bumptech.glide.Glide;
import com.noticripto.MainActivity;
import com.noticripto.R;
import com.noticripto.adapters.NewsAdapter;
import com.noticripto.model.HomePageModel;
import com.noticripto.rest.ApiClient;
import com.noticripto.rest.ApiInterface;
import com.noticripto.retrofit.CryptoList;
import com.noticripto.retrofit.Datum;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
public class NewsDetailActivity extends AppCompatActivity {
Toolbar toolbar;
TextView sourceName, newsTitle, newsDesc, newsDate, newsView,labelSimilar;
Button viewMore;
ImageView imagy,small_icn;
ProgressBar progressBar;
RecyclerView recyclerView3;
CryptoListAdapter adapterCoin2;
ApiInterface apiInterfaceCoin2;
List<Datum> cryptoList2 = null;
HomePageModel.News detailNews = null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_news_detail);
apiInterfaceCoin2 = APIClientCoin.getClient().create(ApiInterface.class);
recyclerView3 = findViewById(R.id.my_recycler_view_coin_details);
initViews();
LoadNewsDetails();
getCoinList();
}
private void LoadNewsDetails() {
// Calling our api
ApiInterface apiInterface = ApiClient.getApiClient().create(ApiInterface.class);
Map<String, String> params = new HashMap<>();
params.put("id" , getIntent().getIntExtra("pid", 0) + "");
Call<HomePageModel> call = apiInterface.getNewsDetailsById(params);
call.enqueue(new Callback<HomePageModel>() {
#Override
public void onResponse(Call<HomePageModel> call, Response<HomePageModel> response) {
// Update the news layout
detailNews = response.body().getNews().get(0);
newsTitle.setText(detailNews.getTitle());
newsDesc.setText(NewsAdapter.removeHtml(detailNews.getPostContent()));
if (detailNews.getImage().length() >=1){
Glide.with(NewsDetailActivity.this)
.load(detailNews.getImage())
.placeholder(R.drawable.image1)
.into(imagy);
}else{
imagy.setVisibility(View.GONE);
}
}
#Override
public void onFailure(Call<HomePageModel> call, Throwable t) {
progressBar.setVisibility(View.GONE);
}
});
}
private void initViews() {
toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setTitle("");
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
toolbar.setNavigationIcon(R.drawable.icon_arrow_back_white);
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
onBackPressed();
}
});
}
cryptoList2 = new ArrayList<>();
adapterCoin2 = new CryptoListAdapter(cryptoList2);
// sourceName = findViewById(R.id.source_name );
newsTitle = findViewById(R.id.news_title);
newsDesc = findViewById(R.id.news_desc);
newsDate = findViewById(R.id.news_date);
//newsView = findViewById(R.id.news_view);
labelSimilar = findViewById(R.id.label_similar_news);
//viewMore = findViewById(R.id.view_more);
progressBar = findViewById(R.id.progressBar);
imagy =findViewById(R.id.news_image);
//small_icn = findViewById(R.id.small_icn);
recyclerView3 = findViewById(R.id.my_recycler_view_coin_details);
LinearLayoutManager linearLayoutManager3 =new LinearLayoutManager(getApplicationContext(), LinearLayoutManager.HORIZONTAL, false);
recyclerView3.setLayoutManager(linearLayoutManager3);
recyclerView3.setNestedScrollingEnabled(false);
recyclerView3.setAdapter(adapterCoin2);
adapterCoin2.notifyItemInserted(0);
recyclerView3.scrollToPosition(0);
}
public void getCoinList() {
Call<CryptoList> call2 = apiInterfaceCoin2.doGetUserList("20");
call2.enqueue(new Callback<CryptoList>() {
#Override
public void onResponse(Call<CryptoList> call, Response<CryptoList> response)
{
CryptoList list = response.body();
cryptoList2.clear();
cryptoList2.addAll(list.getData());
adapterCoin2.notifyDataSetChanged();
System.out.println("List getData = " + list.getData());
}
#Override
public void onFailure(Call<CryptoList> call, Throwable t) {
Toast.makeText(NewsDetailActivity.this, "onFailure",
Toast.LENGTH_SHORT).show();
Log.d("XXXX", t.getLocalizedMessage());
call.cancel();
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.news_details_menu, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(#NonNull MenuItem item) {
if (item.getItemId() == R.id.share){
if (detailNews != null){
// Opening sharing options
Intent i = new Intent(Intent.ACTION_SEND);
i.setType("text/plain");
i.putExtra(Intent.EXTRA_SUBJECT, detailNews.getTitle());
i.putExtra(Intent.EXTRA_TEXT, detailNews.getPostContent());
startActivity(i);
}else{
Toast.makeText(this, "Lo Sentimos!", Toast.LENGTH_SHORT).show();
}
}
return super.onOptionsItemSelected(item);
}
}
crypto_list_item_in_detail_activity.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/cardViewCoinDetails"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="3dp"
android:layout_marginBottom="10dp"
android:layout_marginTop="10dp"
android:layout_marginLeft="10dp"
app:cardCornerRadius="8dp"
app:cardBackgroundColor="#android:color/white">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:id="#+id/symbolNameDetails"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="roboto_bold"
android:gravity="center"
android:paddingBottom="3dp"
android:singleLine="true"
android:text="Symbol"
android:textAppearance="#android:style/TextAppearance.Large"
android:textColor="#000"
android:textSize="15dp" />
<TextView
android:id="#+id/priceDetails"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:singleLine="true"
android:textStyle="bold"
android:text="Price"
android:textSize="13dp"
android:layout_marginBottom="5dp"
android:layout_toRightOf="#+id/symbolNameDetails"
android:textAppearance="#android:style/TextAppearance.Medium"
android:textColor="#000" />
</RelativeLayout>
</LinearLayout>
</androidx.cardview.widget.CardView>
activity_news_details.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".activities.NewsDetailActivity">
<androidx.appcompat.widget.Toolbar
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/toolbar"
android:background="#color/black"/>
<RelativeLayout
android:layout_width="match_parent"
android:layout_below="#+id/toolbar"
android:layout_height="wrap_content">
<ProgressBar
android:id="#+id/progressBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone"
android:layout_centerHorizontal="true"
android:layout_marginTop="5dp"
android:indeterminateTint="#color/yellow"/>
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="none"
android:overScrollMode="never"
android:layout_below="#+id/progressBar">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/my_recycler_view_coin_details"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="horizontal" />
<androidx.cardview.widget.CardView
android:id="#+id/wrapper_cardview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:id="#+id/wrapper"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
</LinearLayout>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/news_title"
android:text="Titulo"
android:textStyle="bold"
android:layout_below="#+id/wrapper"
android:textSize="22sp"
android:paddingLeft="16dp"
android:textAlignment="center"
android:paddingStart="16dp"
android:textColor="#color/black"
android:gravity="center_horizontal" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/wrapper_news"
android:layout_below="#id/news_title"
android:paddingLeft="10dp"
android:layout_marginTop="4dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/news_date"
android:paddingEnd="10dp"
android:paddingStart="10dp"
android:text="Date"
android:paddingRight="5dp"/>
</RelativeLayout>
<ImageView
android:layout_width="match_parent"
android:adjustViewBounds="true"
android:id="#+id/news_image"
android:src="#drawable/icon_youtube"
android:layout_below="#id/wrapper_news"
android:layout_height="wrap_content"/>
<TextView
android:id="#+id/news_desc"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/news_image"
android:fontFamily="#font/roboto"
android:padding="10dp"
android:text="News Description"
android:firstBaselineToTopHeight="0dp"
android:includeFontPadding="false"
android:lineSpacingExtra="2dp"
android:textColor="#color/black"
android:textSize="17sp" />
</RelativeLayout>
</androidx.cardview.widget.CardView>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/wrapper_cardview"
android:padding="10dp"
android:textSize="18sp"
android:text="Similar News"
android:visibility="gone"
android:id="#+id/label_similar_news"/>
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/news_recy"
android:layout_below="#id/label_similar_news"/>
</RelativeLayout>
</androidx.core.widget.NestedScrollView>
</RelativeLayout>
</RelativeLayout>
And finally, I am trying to get the list from here:
CryptoListAdapter
package com.noticripto.adapters;
import android.content.Context;
import android.graphics.Color;
import androidx.recyclerview.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.noticripto.retrofit.Datum;
import com.noticripto.R;
import java.util.List;
public class CryptoListAdapter extends
RecyclerView.Adapter<CryptoListAdapter.ViewHolder> {
private List<Datum> mData;
private ItemClickListener mClickListener;
ImageView arrowImage;
RelativeLayout layout;
RelativeLayout symbolBG;
// data is passed into the constructor
public CryptoListAdapter(List<Datum> data) {
this.mData = data;
}
// Usually involves inflating a layout from XML and returning the holder
// inflates the row layout from xml when needed
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
Context context = parent.getContext();
LayoutInflater inflater = LayoutInflater.from(context);
View view = inflater.inflate(R.layout.crypto_list_item, parent, false);
ViewHolder viewHolder = new ViewHolder(view);
layout = view.findViewById(R.id.relativeBG);
symbolBG = view.findViewById(R.id.symbolBG);
arrowImage = view.findViewById(R.id.arrow_img);
return viewHolder;
}
// Involves populating data into the item through holder
// binds the data to the TextView in each row
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
// Get the data model based on position
Datum datum = mData.get(position);
TextView symbolName = holder.symbolName;
symbolName.setText(" (" + datum.getSymbol() + ")");
// Set item views based on your views and data model
TextView name = holder.name;
name.setText(datum.getName());
TextView symbolNameDetails = holder.symbolNameDetails;
symbolNameDetails.setText(datum.getSymbol());
TextView price = holder.price;
TextView priceDetails = holder.priceDetails;
if(datum.getQuote().getUSD().getPrice() >= 1) {
price.setText("$" + String.format("%.2f", datum.getQuote().getUSD().getPrice()));
priceDetails.setText("$" + String.format("%.2f", datum.getQuote().getUSD().getPrice()));
}else{
price.setText("$" + String.format("%f", datum.getQuote().getUSD().getPrice()));
priceDetails.setText("$" + String.format("%.2f", datum.getQuote().getUSD().getPrice()));
}
//TextView marketCap = holder.marketCap;
//marketCap.setText("Market Cap: $" + String.format("%,d",
Math.round(datum.getQuote().getUSD().getMarketCap())));
//TextView volume24h = holder.volume24h;
//volume24h.setText("Volume/24h: $" + String.format("%,d",
Math.round(datum.getQuote().getUSD().getVolume24h())));
//TextView textView1h = holder.textView1h;
//textView1h.setText(String.format("1h: %.2f",
datum.getQuote().getUSD().getPercentChange1h()) + "%");
TextView textView24h = holder.textView24h;
textView24h.setText(String.format("%.2f", datum.getQuote().getUSD().getPercentChange24h()) + "%");
if(datum.getQuote().getUSD().getPercentChange24h() < 0.0){
//red
textView24h.setText(String.format("%.2f", Math.abs(datum.getQuote().getUSD().getPercentChange24h())) + "%");
textView24h.setTextColor(Color.parseColor("#ffffff"));
arrowImage.setImageResource(R.drawable.arrow_down_white);
layout.setBackgroundColor(Color.parseColor("#EA3943"));
symbolBG.setBackgroundColor(Color.parseColor("#EA3943"));
priceDetails.setTextColor(Color.parseColor("#EA3943"));
}else{
//green
textView24h.setText(String.format("%.2f",
Math.abs(datum.getQuote().getUSD().getPercentChange24h())) + "%");
textView24h.setTextColor(Color.parseColor("#ffffff"));
arrowImage.setImageResource(R.drawable.arrow_up_white);
layout.setBackgroundColor(Color.parseColor("#18C784"));
symbolBG.setBackgroundColor(Color.parseColor("#18C784"));
priceDetails.setTextColor(Color.parseColor("#18C784"));
}
//TextView textView7d = holder.textView7d;
//textView7d.setText(String.format("7d: %.2f",
datum.getQuote().getUSD().getPercentChange7d()) + "%");
}
// Returns the total count of items in the list
// total number of rows
#Override
public int getItemCount() {
return mData.size();
}
// Provide a direct reference to each of the views within a data item
// Used to cache the views within the item layout for fast access
// stores and recycles views as they are scrolled off screen
public class ViewHolder extends RecyclerView.ViewHolder implements
View.OnClickListener {
// Your holder should contain a member variable
// for any view that will be set as you render a row
TextView name;
TextView price;
TextView marketCap;
TextView volume24h;
TextView textView1h;
TextView textView24h;
TextView textView7d;
TextView symbolName;
TextView priceDetails;
TextView symbolNameDetails;
// We also create a constructor that accepts the entire item row
// and does the view lookups to find each subview
ViewHolder(View itemView) {
// Stores the itemView in a public final member variable that can be used
// to access the context from any ViewHolder instance.
super(itemView);
name = itemView.findViewById(R.id.name);
price = itemView.findViewById(R.id.price);
//marketCap = itemView.findViewById(R.id.marketCap);
// volume24h = itemView.findViewById(R.id.volume24h);
//textView1h = itemView.findViewById(R.id.textView1h);
textView24h = itemView.findViewById(R.id.textView24h);
//textView7d = itemView.findViewById(R.id.textView7d);
symbolName = itemView.findViewById(R.id.symbolName);
priceDetails = itemView.findViewById(R.id.priceDetails);
symbolNameDetails = itemView.findViewById(R.id.symbolNameDetails);
itemView.setOnClickListener(this);
}
#Override
public void onClick(View view) {
if (mClickListener != null) mClickListener.onItemClick(view,
getAdapterPosition());
}
}
// convenience method for getting data at click position
public Datum getItem(int id) {
return mData.get(id);
}
// allows clicks events to be caught
public void setClickListener(ItemClickListener itemClickListener) {
this.mClickListener = itemClickListener;
}
// parent activity will implement this method to respond to click events
public interface ItemClickListener {
void onItemClick(View view, int position);
}
}
The log doesn't say anything helpful just that the list might be empty but the same list is working on the MainActivity so, I believe the problem is inside my NewsDetailActivity.
I also tried some of the answers and none of them helped me:
RecyclerView is not showing
RecyclerView is not showing items
CardView is not showing properly in RecyclerView
Again, i just want to display my list from CryptoListAdapter under the NewsDetailActivity toolbar...in a nice cardview
This is what I want to do...

this is simple and normal! you fill your array in getCoinList() but set adapter for RecyclerView in initViews() in this way your array not filled yet but you pass it to your recycler! , you should get your array first , then pass it to adapter and set adapter to RecyclerView.

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Masking an image in RecyclerView programmatically

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Expected layout
I'm using simple, square .jpg pictures and I want to apply a consistent mask across all listings (a single object, codewise).
There are a few answers out there for making masks but I can't seem to apply those to my needs,
as all or most of them are referring to a simple layout or a single ImageView, but how should it work in my case? Code:
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:background="#color/colorPrimaryLight"
tools:context=".MainActivity">
<androidx.appcompat.widget.Toolbar
android:id="#+id/tb"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:elevation="4dp"
android:theme="#style/ThemeOverlay.AppCompat.ActionBar"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
/>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:paddingTop="25dp"
android:soundEffectsEnabled="true"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/tb" />
<com.google.android.material.navigation.NavigationView
android:layout_width="50dp"
android:layout_height="16dp"
app:layout_constraintBottom_toBottomOf="#id/tb"
app:layout_constraintEnd_toEndOf="#id/tb"
app:layout_constraintHorizontal_bias="0.083"
app:layout_constraintStart_toStartOf="#id/tb"
app:layout_constraintTop_toTopOf="#id/tb"
app:layout_constraintVertical_bias="0.4" />
</androidx.constraintlayout.widget.ConstraintLayout>
item_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
style="#android:style/Widget.Material.Button.Borderless"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal">
<ImageView
android:id="#+id/imageView"
android:layout_width="124dp"
android:layout_height="130dp"
android:contentDescription="#string/descriptor"
app:layout_constraintBottom_toBottomOf="#id/btn_read_more"
app:layout_constraintEnd_toEndOf="#id/btn_read_more"
app:layout_constraintHorizontal_bias="0.947"
app:layout_constraintStart_toStartOf="#id/btn_read_more"
app:layout_constraintTop_toTopOf="#id/btn_read_more"
app:layout_constraintVertical_bias="0.421"
app:srcCompat="#mipmap/ic_launcher_round" />
<TextView
android:id="#+id/textTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/descriptor"
android:textColor="#color/text_color"
android:textDirection="rtl"
android:textSize="20sp"
android:textStyle="bold"
app:layout_constraintBottom_toTopOf="#id/textBody"
app:layout_constraintEnd_toStartOf="#id/imageView"
app:layout_constraintHorizontal_bias="0.979"
app:layout_constraintStart_toStartOf="#id/btn_read_more"
app:layout_constraintTop_toTopOf="#id/btn_read_more" />
<TextView
android:id="#+id/textBody"
android:layout_width="268dp"
android:layout_height="90dp"
android:text="#string/descriptor"
android:textColor="#color/text_color"
android:textDirection="rtl"
android:textSize="14sp"
app:layout_constraintBottom_toBottomOf="#id/btn_read_more"
app:layout_constraintTop_toBottomOf="#id/textTitle"
app:layout_constraintStart_toStartOf="#id/btn_read_more"
app:layout_constraintEnd_toStartOf="#id/imageView"
tools:layout_editor_absoluteX="16dp"
tools:layout_editor_absoluteY="45dp" />
<Button
android:id="#+id/btn_read_more"
android:layout_width="408dp"
android:layout_height="149dp"
android:layout_marginStart="2dp"
android:layout_marginTop="2dp"
android:layout_marginEnd="1dp"
android:background="#00FAFAFA"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
MainActivity.java
package com.example.mytrip;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import androidx.appcompat.widget.Toolbar;
import android.os.Bundle;
import android.view.Menu;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
RecyclerView recyclerView;
#Override
// show the settings overflow menu
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// setting the a tool bar as an action bar
Toolbar action_bar = (Toolbar) findViewById(R.id.tb);
setSupportActionBar(action_bar);
recyclerView = findViewById(R.id.rv);
// setting a linear layout (vertical) for the recycle view
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(layoutManager);
// filling the array list
List<ModelClass> modelClassList = new ArrayList<>();
modelClassList.add(new ModelClass(R.drawable.shofet_pic, getString(R.string.shofet_title),
this.getResources().getString(R.string.shofet_desc).substring(0,75) + "..."));
modelClassList.add(new ModelClass(R.drawable.dor_pic, getString(R.string.dor_title),
this.getResources().getString(R.string.dor_desc).substring(0,75) + "..."));
modelClassList.add(new ModelClass(R.drawable.sorek_pic, getString(R.string.sorek_title),
this.getResources().getString(R.string.sorek_desc).substring(0,75) + "..."));
modelClassList.add(new ModelClass(R.drawable.red_pic, getString(R.string.red_title),
this.getResources().getString(R.string.red_desc).substring(0,75) + "..."));
modelClassList.add(new ModelClass(R.drawable.ayun_pic, getString(R.string.ayun_title),
this.getResources().getString(R.string.ayun_desc).substring(0,75) + "..."));
modelClassList.add(new ModelClass(R.drawable.gedi_pic, getString(R.string.gedi_title),
this.getResources().getString(R.string.gedi_desc).substring(0,75) + "..."));
modelClassList.add(new ModelClass(R.drawable.ofir_pic, getString(R.string.ofir_title),
this.getResources().getString(R.string.ofir_desc).substring(0,75) + "..."));
modelClassList.add(new ModelClass(R.drawable.sharon_pic, getString(R.string.sharon_title),
this.getResources().getString(R.string.sharon_desc).substring(0,75) + "..."));
modelClassList.add(new ModelClass(R.drawable.meron_pic, getString(R.string.meron_title),
this.getResources().getString(R.string.meron_desc).substring(0,75) + "..."));
modelClassList.add(new ModelClass(R.drawable.snir_pic, getString(R.string.snir_title),
this.getResources().getString(R.string.snir_desc).substring(0,75) + "..."));
modelClassList.add(new ModelClass(R.drawable.cave_pic,getString(R.string.cave_title),
this.getResources().getString(R.string.cave_desc).substring(0,75) + "..."));
// using the adapter class
Adapter adapter = new Adapter(modelClassList);
recyclerView.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
}
Adapter.java
package com.example.mytrip;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import java.util.List;
public class Adapter extends RecyclerView.Adapter<Adapter.Viewholder> {
private List<ModelClass> modelClassList;
public Adapter(List<ModelClass> modelClassList) {
this.modelClassList = modelClassList;
}
#NonNull
#Override
public Viewholder onCreateViewHolder(#NonNull ViewGroup viewGroup, int viewType) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_layout,
viewGroup, false);
return new Viewholder(view);
}
#Override
public void onBindViewHolder(#NonNull final Viewholder viewholder, final int position) {
final int resource = modelClassList.get(position).getImageIcon();
final String title = modelClassList.get(position).getTitle();
final String body = modelClassList.get(position).getBody();
viewholder.btnReadMore.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(v.getContext(), AllTripInfo.class);
intent.putExtra("tripId", position);
v.getContext().startActivity(intent);
}
});
viewholder.setData(resource, title, body);
}
#Override
public int getItemCount() {
return modelClassList.size();
}
static class Viewholder extends RecyclerView.ViewHolder{
private ImageView imageView;
private TextView title;
private TextView body;
Button btnReadMore;
public Viewholder(#NonNull View itemView) {
super(itemView);
btnReadMore = itemView.findViewById(R.id.btn_read_more);
imageView = itemView.findViewById(R.id.imageView);
title = itemView.findViewById(R.id.textTitle);
body = itemView.findViewById(R.id.textBody);
}
private void setData(int imageResource, String titleText, String bodyText)
{
imageView.setImageResource(imageResource);
title.setText(titleText);
body.setText(bodyText);
}
}
}
ModelClass.java
package com.example.mytrip;
public class ModelClass {
private int imageIcon;
String title;
String body;
public ModelClass(int imageIcon, String title, String body) {
this.imageIcon = imageIcon;
this.title = title;
this.body = body;
}
public int getImageIcon() {
return imageIcon;
}
public String getTitle() {
return title;
}
public String getBody() {
return body;
}
}
For answer's sake, I want a circular mask, whether programmatically or even a white .png extracted via Photoshop.
Any further tips for optimizing my code in any way are welcome as well. I will definitely have to do something about the fact that the listings are not clickable themselves, but rather have a big transparent button on top...
Thank you!

Ronny Just Change in your Item_layout.
Just Add the circularImage library in your app-level gradle file.
CircleImageView
your item layout will look like:
<RelativeLayout>
<Text></Text>
<de.hdodenhof.circleimageview.CircleImageView>
//add endParent= true
</de.hdodenhof.circleimageview.CircleImageView>
</RelativeLayout>

Android Studio RecyclerView wont show my data when i add toolbar at my `layout.xml` file

I created a page where it will show the firebase data in a RecyclerView. It work but I decided to put a toolbar at the top of the page to have a back function. After I put the toolbar in my layout file, the RecyclerView is not showing any data anymore. I think that my layout XML file is wrong. Thanks in advance for anyone helping.
Actity file
package com.example.attendanceappvqyfyp;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.Toolbar;
import com.example.attendanceappvqyfyp.Interface.itemClickListener;
import com.example.attendanceappvqyfyp.Common.Common;
import com.example.attendanceappvqyfyp.Model.LecturerClass;
import com.example.attendanceappvqyfyp.Model.News;
import com.example.attendanceappvqyfyp.Model.Timetable;
import com.firebase.ui.database.FirebaseRecyclerAdapter;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.example.attendanceappvqyfyp.Common.Common;
public class LecturerClassList extends AppCompatActivity {
RecyclerView recyclerView;
RecyclerView.LayoutManager layoutManager;
FirebaseDatabase database;
DatabaseReference lecturerclass;
DatabaseReference news;
FirebaseRecyclerAdapter<LecturerClass,LecturerClassViewHolder> adapter;
TextView newscourse, newsclass;
EditText newsdescription;
Toolbar toolbar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_lecturer_class_list);
//Firebase
database = FirebaseDatabase.getInstance();
lecturerclass = database.getReference("Class");
news = database.getReference("News");
recyclerView = (RecyclerView)findViewById(R.id.recycler_lecturerclass);
recyclerView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
//Toolbar code
toolbar = findViewById(R.id.toolbar);
toolbar.setTitle("Class List");
toolbar.setNavigationIcon(R.drawable.ic_arrow_back_black_24dp);
loadLecturerClass(Common.currentLecturer.getName());
}
private void loadLecturerClass(String Lecturer) {
adapter = new FirebaseRecyclerAdapter<LecturerClass, LecturerClassViewHolder>(LecturerClass.class, R.layout.lecturerclass_item, LecturerClassViewHolder.class, lecturerclass.orderByChild("lecturer").equalTo(Lecturer)) {
#Override
protected void populateViewHolder(LecturerClassViewHolder lecturerClassViewHolder, LecturerClass lecturerClass, int i) {
lecturerClassViewHolder.lclasstitle.setText("Class :" + adapter.getRef(i).getKey());
lecturerClassViewHolder.ldate.setText("Day :" + lecturerClass.getDay());
lecturerClassViewHolder.ltime.setText("Time :" + lecturerClass.getTime());
lecturerClassViewHolder.lclassroom.setText("Classroom :" + lecturerClass.getClassroom());
lecturerClassViewHolder.lcourse.setText(lecturerClass.getCourse());
lecturerClassViewHolder.setItemClickListener(new itemClickListener() {
#Override
public void onClick(View view, int position, boolean isLongClick) {
//code later
}
});
}
};
recyclerView.setAdapter(adapter);
}
#Override
public boolean onContextItemSelected(MenuItem item) {
if(item.getTitle().equals(Common.News))
{
showNewsDialog(adapter.getRef(item.getOrder()).getKey(),adapter.getItem(item.getOrder()));
}
return super.onContextItemSelected(item);
}
private void showNewsDialog(final String course, final LecturerClass item) {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(LecturerClassList.this);
alertDialog.setTitle("Make Announcement");
alertDialog.setMessage("Make announcement about this class.");
LayoutInflater inflater = this.getLayoutInflater();
View lecturer_make_news = inflater.inflate(R.layout.activity_lecturer_make_news, null);
newscourse = lecturer_make_news.findViewById(R.id.NewsCourse);
newsclass = lecturer_make_news.findViewById(R.id.NewsClass);
newsdescription = lecturer_make_news.findViewById(R.id.NewsDescription);
newscourse.setText("Course: "+item.getCourse());
newsclass.setText("Subject: " + course);
alertDialog.setView(lecturer_make_news);
alertDialog.setPositiveButton("Post", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int i) {
if(newsdescription.getText().toString().isEmpty()){
Toast.makeText(LecturerClassList.this, "Post cancel, description cannot be empty.", Toast.LENGTH_SHORT).show();
}
else {
News lnews = new News(
item.getCourse(),
course,
newsdescription.getText().toString()
);
news.child(String.valueOf(System.currentTimeMillis())).setValue(lnews);
Toast.makeText(LecturerClassList.this, "Announcement post successfully.", Toast.LENGTH_SHORT).show();
finish();
}
}
});
alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();;
}
});
alertDialog.show();
}
}
Activity file for viewholder
package com.example.attendanceappvqyfyp;
import android.view.ContextMenu;
import android.view.View;
import android.widget.TextView;
import com.example.attendanceappvqyfyp.Common.Common;
import androidx.recyclerview.widget.RecyclerView;
import com.example.attendanceappvqyfyp.Interface.itemClickListener;
public class LecturerClassViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener,View.OnCreateContextMenuListener {
public TextView lclasstitle, ldate, ltime, lclassroom, lcourse;
private itemClickListener itemClickListener;
public LecturerClassViewHolder(View itemView) {
super(itemView);
lclasstitle = (TextView)itemView.findViewById(R.id.lclasstitle);
ldate = (TextView)itemView.findViewById(R.id.ldate);
ltime = (TextView)itemView.findViewById(R.id.ltime);
lclassroom = (TextView)itemView.findViewById(R.id.lclassroom);
lcourse = (TextView)itemView.findViewById(R.id.lcourse);
itemView.setOnCreateContextMenuListener(this);
itemView.setOnClickListener(this);
}
public void setItemClickListener(itemClickListener itemClickListener) {
this.itemClickListener = itemClickListener;
}
#Override
public void onClick(View view) {
itemClickListener.onClick(view, getAdapterPosition(), false);
}
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
menu.setHeaderTitle("Select");
menu.add(0,0,getAdapterPosition(), Common.News);
}
}
Layout file for recyclerview
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".LecturerClassList">
<android.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:theme="#style/ThemeOverlay.AppCompat.Dark" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recycler_lecturerclass"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="vertical"
app:layout_constraintTop_toBottomOf="#+id/toolbar" />
</androidx.constraintlayout.widget.ConstraintLayout>
Layout file for itemview
<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="160dp"
app:cardElevation="4dp"
android:layout_marginBottom="8dp"
>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/lclasstitle"
android:layout_width="match_parent"
android:layout_height="40dp"
android:gravity="center"
android:text=""
android:textColor="#android:color/black"
android:textSize="20sp" />
<TextView
android:id="#+id/ldate"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_alignBottom="#id/lclasstitle"
android:layout_marginBottom="-40dp"
android:gravity="center"
android:text=""
android:textColor="#android:color/black"
android:textSize="20sp" />
<TextView
android:id="#+id/ltime"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_alignBottom="#id/ldate"
android:layout_marginBottom="-40dp"
android:gravity="center"
android:text=""
android:textColor="#android:color/black"
android:textSize="20sp" />
<TextView
android:id="#+id/lclassroom"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_alignParentBottom="true"
android:gravity="center"
android:text=""
android:textColor="#android:color/black"
android:textSize="20sp" />
<TextView
android:id="#+id/lcourse"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_alignParentBottom="true"
android:gravity="center"
android:text=""
android:visibility="invisible"
android:textColor="#android:color/black"
android:textSize="20sp" />
</RelativeLayout>
</androidx.cardview.widget.CardView>
Thanks to ZeePee for giving this link Display Back Arrow on Toolbar, although the toolbar didnt work for me, i change it back to actionbar and use the code from the link and it work.

Try adding horizontal constraints for Toolbar and Recycler View. After that you need to specify where do you want your single item widgets in Relative layout

Clickable element of ListView with gridView inside (Android)

I want to make listView element clickable.
When i add gridView inside listView then i cant click on listView element..
How to make listView element clickable when gridView is inside listView?
I try to set focusable, descendantFocusability, clickable...
ProductsFragment.java
package pl.pieczolap.ui.products;
import android.content.Context;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.toolbox.Volley;
import com.bumptech.glide.Glide;
import com.squareup.picasso.Picasso;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AlertDialog;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.ViewModelProviders;
import pl.globoox.pieczolap.R;
import pl.pieczolap.API.getProducts;
import pl.pieczolap.MyGridView;
public class ProductsFragment extends Fragment {
private ProductsViewModel StampViewModel;
ArrayList<String> product_uid_shop = new ArrayList();
ArrayList<String> product_uid_product = new ArrayList();
ArrayList<String> product_name = new ArrayList();
ArrayList<String> product_info = new ArrayList();
ArrayList<String> product_stamps = new ArrayList();
ArrayList<String> product_clientStamps = new ArrayList();
MyGridView gridView_stamps;
ListView listView_products;
SharedPreferences sharedPref;
Integer clientStamps;
Integer needStamps;
ImageView imageView_loadingData;
TextView textView_winner;
public View onCreateView(#NonNull LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
StampViewModel =
ViewModelProviders.of(this).get(ProductsViewModel.class);
View root = inflater.inflate(R.layout.fragment_products, container, false);
// LOAD GIF LOADING IMAGE
imageView_loadingData = root.findViewById(R.id.imageView_loadingData);
Glide.with(root).load(R.drawable.loadingdots).placeholder(R.drawable.loadingdots).into(imageView_loadingData);
listView_products = root.findViewById(R.id.listView_products);
sharedPref = getActivity().getApplicationContext().getSharedPreferences("pl.piecozlap", Context.MODE_PRIVATE);
Bundle arguments = this.getArguments();
String uid_shop = arguments.getString("uid_shop", "none");
// GET ALL STAMPS
Response.Listener<String> responseListenerUserComments = new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
JSONObject jsonResponse = new JSONObject(response);
int errorCode = jsonResponse.getInt("errorCode");
// CANT CONNECT TO DATABASE
if (errorCode == 1) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity().getApplicationContext());
builder.setMessage("Brak połączenia z bazą danych!").setNegativeButton("PONÓW", null).create().show();
}
// GET STAMP AND PRODUCT INFO
if (errorCode == 2) {
JSONArray products = jsonResponse.getJSONArray("products");
for (int i = 0; i < products.length(); i++) {
JSONObject jsonObject = products.getJSONObject(i);
product_uid_shop.add(jsonObject.getString("uid_shop"));
product_uid_product.add(jsonObject.getString("uid_product"));
product_name.add(jsonObject.getString("name"));
product_info.add(jsonObject.getString("info"));
product_stamps.add(jsonObject.getString("stamps"));
product_clientStamps.add(jsonObject.getString("clientStamps"));
}
// HIDE LOADING GIF
imageView_loadingData.setVisibility(View.INVISIBLE);
ProductsAdapter productsAdapter = new ProductsAdapter();
listView_products.setAdapter(productsAdapter);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
};
getProducts getStamps = new getProducts(sharedPref.getString("uid_client", "none"), uid_shop, responseListenerUserComments);
RequestQueue queue = Volley.newRequestQueue(getActivity().getApplicationContext());
queue.add(getStamps);
return root;
}
// LISTVIEW CUSTOMADAPTER
// LISTVIEW CUSTOMADAPTER
// LISTVIEW CUSTOMADAPTER
// LISTVIEW CUSTOMADAPTER
public class ProductsAdapter extends BaseAdapter {
#Override
public int getCount() {
return product_uid_shop.size();
}
#Override
public Object getItem(int position) {
return null;
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
convertView = getLayoutInflater().inflate(R.layout.customlayout_products, null);
clientStamps = Integer.valueOf(product_clientStamps.get(position));
needStamps = Integer.valueOf(product_stamps.get(position));
TextView textView_product_name = convertView.findViewById(R.id.textView_product_name);
TextView textView_product_info = convertView.findViewById(R.id.textView_product_info);
textView_product_name.setText(String.valueOf(clientStamps));
textView_product_info.setText(product_info.get(position));
// WINNER TEXTVIEW
TextView textView_winner = convertView.findViewById(R.id.textView_winner);
if (clientStamps == needStamps) {
textView_winner.setVisibility(View.VISIBLE);
} else {
textView_winner.setVisibility(View.INVISIBLE);
}
// -------------------- //
// CLICK ON SHOP //
// -------------------- //
convertView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Log.d("TAGA", "sasdadsa");
new AlertDialog.Builder(getActivity().getApplicationContext())
.setTitle("Delete entry")
.setMessage("Are you sure you want to delete this entry?")
.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// Continue with delete operation
}
})
.setNegativeButton(android.R.string.no, null)
.setIcon(android.R.drawable.ic_dialog_alert)
.show();
}
});
gridView_stamps = convertView.findViewById(R.id.gridView_stamps);
StampsAdapter stampAdapter = new StampsAdapter();
gridView_stamps.setAdapter(stampAdapter);
gridView_stamps.setClickable(false);
return convertView;
}
}
// STAMP GRIDVIEW
// STAMP GRIDVIEW
// STAMP GRIDVIEW
// STAMP GRIDVIEW
public class StampsAdapter extends BaseAdapter {
#Override
public int getCount() {
return needStamps;
}
#Override
public Object getItem(int position) {
return null;
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
convertView = getLayoutInflater().inflate(R.layout.customlayout_onestamp, null);
if (position < clientStamps) {
final ImageView imageView = convertView.findViewById(R.id.imgageView_onestamp);
Picasso.get().load("http://pieczolap.pl/admin/shops/999/stamp.jpg").into(imageView);
}
return convertView;
}
}
}
customlayout_products.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="wrap_content"
android:layout_height="400dp"
android:layout_marginLeft="20dp"
android:layout_marginTop="20dp"
android:layout_marginRight="20dp"
android:layout_marginBottom="50dp"
android:background="#drawable/customlayout_shops_background"
android:orientation="vertical">
<RelativeLayout
android:id="#+id/relativeLayout"
android:layout_width="wrap_content"
android:layout_height="60dp"
android:background="#drawable/customlayout_shops_background">
<TextView
android:id="#+id/textView_product_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:text="Info"
android:textSize="15dp" />
<TextView
android:id="#+id/textView_product_info"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/textView_product_name"
android:layout_margin="5dp"
android:text="Info"
android:textSize="10dp" />
</RelativeLayout>
<pl.pieczolap.MyGridView
android:id="#+id/gridView_stamps"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:clickable="false"
android:columnWidth="100dp"
android:gravity="center"
android:horizontalSpacing="10dp"
android:numColumns="4"
android:padding="10dp"
android:stretchMode="spacingWidth"
android:verticalSpacing="10dp"
app:layout_constraintTop_toBottomOf="#id/relativeLayout"
tools:ignore="MissingConstraints" />
<TextView
android:id="#+id/textView_winner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:gravity="center"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
android:rotation="-6"
android:layout_margin="5dp"
android:textColor="#FF0000"
android:textStyle="bold"
android:text="Zebrano wszystkie!"
android:textSize="30dp" />
</androidx.constraintlayout.widget.ConstraintLayout>
fragment_products.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:descendantFocusability="blocksDescendants"
android:focusable="true"
android:layout_height="match_parent">
<ListView
android:id="#+id/listView_products"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:descendantFocusability="blocksDescendants"
android:divider="#null"
android:focusable="true"
android:clickable="true"
android:dividerHeight="10dp"
android:padding="4dp"
android:layout_marginBottom="70dp"
app:layout_constraintTop_toBottomOf="#+id/button_addShop" />
<ImageView
android:id="#+id/imageView_loadingData"
android:layout_width="350dp"
android:layout_height="100dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

How to add the ListView element to be referenced in the individual Activity files

The app crashes as soon as any of the list Activities are launched:
NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter' on a null object reference
My instructor says its happening because the layouts haven't been configured correctly. Right now, the list_item is being inflated as the Activity layout. Please create a separate layout, such as activity_list and add the ListView element there to be referenced in the individual Activity files
Here's the code
MainActivity
package com.example.tourguide;
import android.content.Intent;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.*;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button event = (Button) findViewById(R.id.events);
Button mall = (Button) findViewById(R.id.malls);
Button resturant = (Button) findViewById(R.id.resturants);
Button university = (Button) findViewById(R.id.uinversities);
event.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent event = new Intent(MainActivity.this, events.class);
startActivity(event); }
});
mall.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent mall = new Intent(MainActivity.this, malls.class);
startActivity(mall);
}
});
resturant.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent resturant = new Intent(MainActivity.this, resturants.class);
startActivity(resturant);
}
});
university.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent university = new Intent(MainActivity.this, universities.class);
startActivity(university);
}
});
}}
WordAdapter.java
package com.example.tourguide;
import android.app.Activity;
import android.content.Context;
import android.support.annotation.LayoutRes;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.ArrayList;
public class WordAdapter extends ArrayAdapter<listitem> {
public WordAdapter(Activity context, ArrayList<listitem> listitems) {
super(context, 0, listitems);
}
public View getView(int position, View convertView, ViewGroup parent) {
View listItemView = convertView;
if(listItemView == null) {
listItemView = LayoutInflater.from(getContext()).inflate(
R.layout.list_item, parent, false);
}
listitem currentItem = getItem(position);
TextView name = (TextView) listItemView.findViewById(R.id.text1);
name.setText(currentItem.getName());
ImageView image = (ImageView) listItemView.findViewById(R.id.image1);
image.setImageResource(currentItem.getImage());
TextView dist = (TextView) listItemView.findViewById(R.id.text2);
dist.setText(currentItem.getDist());
TextView price = (TextView) listItemView.findViewById(R.id.text2);
price.setText(currentItem.getPrice());
return listItemView;
}
}
listitem.java
package com.example.tourguide;
import android.widget.ImageView;
public class listitem {
private String name="";
private int image;
private String dist="";
private String price="";
public listitem(String namea, int imagea, String dista, String pricea){
name = namea;
imagea = image;
dist= dista;
price=pricea;
}
/*********** Set Methods ******************/
public void setName(String name)
{
this.name = name;
}
public void setImage(int image)
{
this.image = image;
}
public void setDist(String dist)
{
this.dist = dist;
}
public void setPrice(String price)
{
this.price = price;
}
/*********** Get Methods ****************/
public String getName()
{
return this.name;
}
public int getImage()
{
return this.image;
}
public String getDist()
{
return this.dist;
}
public String getPrice()
{
return this.price;
}
}
Univerisities.java
package com.example.tourguide;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.ListView;
import java.util.ArrayList;
public class universities extends Activity {
protected void onCreate(Bundle bundle) {
super.onCreate(bundle);
setContentView(R.layout.list_item);
ArrayList<listitem> listitemArrayList = new ArrayList<listitem>();
listitemArrayList.add(new listitem("Prince Sultan University", R.drawable.u1, "AlNarjes Dist", "$"));
listitemArrayList.add(new listitem("Princess Nourah University", R.drawable.u2, "AlNarjes Dist", "$"));
listitemArrayList.add(new listitem("King Saud University", R.drawable.u3, "AlNarjes Dist", "$"));
WordAdapter adapter = new WordAdapter(this, listitemArrayList);
ListView listView = (ListView) findViewById(R.id.list);
listView.setAdapter(adapter);
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.example.tourguide.MainActivity"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/text1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="29sp"
android:textColor="#3DC195"
android:textAlignment="center"
android:text="Tour Guide App" />
<TextView
android:id="#+id/text2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#6AA13F"
android:textSize="18sp"
android:text="Tour Guide App is designed to help you discover Riyadh city sightseeings including events, malls, resturants and universities.the app will be developed periodically to add more features... stay tuned" />
<Button
android:id="#+id/events"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Events"
android:onClick="onClickEvent"/>
<Button
android:id="#+id/malls"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Malls"
android:onClick="onClickMall"/>
<Button
android:id="#+id/resturants"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Resturants"
android:onClick="onClickRest"/>
<Button
android:id="#+id/uinversities"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Universities"
android:onClick="onClickUniv"/>
</LinearLayout>
activity_list.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:id="#+id/list"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
list_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<ImageView
android:id="#+id/image1"
android:layout_width="163dp"
android:layout_height="96dp"
android:layout_marginLeft="15dp"
android:layout_marginTop="15dp"
/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="68dp"
android:layout_marginTop="30dp"
android:orientation="vertical">
<TextView
android:id="#+id/text1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#DB0BA4"
android:textSize="20sp"
/>
<TextView
android:id="#+id/text2"
android:layout_width="113dp"
android:layout_height="wrap_content"
android:textColor="#456233"
android:textSize="15sp"
/>
<TextView
android:id="#+id/text3"
android:layout_width="113dp"
android:layout_height="wrap_content"
android:textColor="#C1B03D"
android:textSize="15sp"
/>
</LinearLayout>
</LinearLayout>
</LinearLayout>

In the file Univerisities.java you should change your layout file to activity_list.xml.
Line
setContentView(R.layout.list_item);
Must be changed to :
setContentView(R.layout.activity_list);

Bro,
First you are trying to inflate the ListView item into you activity, which is wrong:
Change the setContentView(R.layout.list_item) to setContentView(R.layout.activity_list);
Also please check out the ViewHolder pattern for ListView's since the your adapter's getView method should be improved by that to make scrolling even more smooth:
View listItemView = convertView;
if(listItemView == null) {
listItemView = LayoutInflater.from(getContext()).inflate(
R.layout.list_item, parent, false);
}
and if no items are appearing in the list, you should also override the getItemCount on adatpterto return the size of the list.

How to move to next activtity with bundle the touch event is not working

guys in my project i need to click the item on the list and move to next activity using bundle i need to carry some data also, but i have some issue..
Please help me to move to next activity i can't understand what is the mistake i did,when i click on the item it is not even responding..
here i just use "e_name.setText("hiiii")" for testing purpose its not working.
AT THE END I HAVE MENTIONED MY LAYOUT CODES ALSO.
if possible please send me a link to learn more about custom adapter and list view..
//Main activity.java
package com.prematix.ashok.friday_9;
import android.app.ListActivity;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
EditText e_name, e_desig, e_salary;
Button save;
String itemNames[];
String itemDescriptions[];
ListView itemsListView;
ArrayList<Item> list = new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
e_name = (EditText) findViewById(R.id.ed_name);
e_desig = (EditText) findViewById(R.id.ed_desig);
e_salary = (EditText) findViewById(R.id.ed_salary);
save = (Button) findViewById(R.id.save);
itemsListView = (ListView) findViewById(R.id.mylist);
save.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//create adapter object
CustomListAdapter adapter = new CustomListAdapter(getApplicationContext(), generateItemsList());
//set custom adapter as adapter to our list view
itemsListView.setAdapter(adapter);
}
private ArrayList<Item> generateItemsList() {
itemNames = new String[]{e_name.getText().toString()};
itemDescriptions = new String[]{e_desig.getText().toString()};
for (int i = 0; i < itemNames.length; i++) {
list.add(new Item(itemNames[i], itemDescriptions[i]));
}
return list;
}
});
itemsListView.setOnItemClickListener(new AdapterView.OnItemClickListener(){
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
e_name.setText("hiiiii");
}
});
// ListView itemsListView = (ListView)findViewById(R.id.list_view_items);
}
}
//CustommListAdapter.java
package com.prematix.ashok.friday_9;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import java.util.ArrayList;
/**
* Created by ${Nagaveni} on 2017-06-09.
*/
public class CustomListAdapter extends BaseAdapter {
private Context context;
private ArrayList<Item> items;
public CustomListAdapter(Context context,ArrayList<Item> items){
this.context = context;
this.items = items;
}
#Override
public int getCount() {
return items.size();
}
#Override
public Object getItem(int i) {
return items.get(i);
}
#Override
public long getItemId(int i) {
return i;
}
#Override
public View getView(int i, View view, ViewGroup viewGroup) {
if(view == null) {
view = LayoutInflater.from(context).inflate(R.layout.layout_list_view_row_items, viewGroup, false);
}
//get current item to be displayed
Item currentitem = (Item)getItem(i);
//get the text view for item name and item designation
TextView name = (TextView)view.findViewById(R.id.name);
TextView designation = (TextView)view.findViewById(R.id.desig);
TextView salary = (TextView)view.findViewById(R.id.salary);
//sets the text for item name and item designation from the current item object
name.setText(currentitem.getNames());
designation.setText(currentitem.getDesignation());
salary.setText("10,000");
//returns the view for current row
return view;
}
}
//here is my layout code
layout_list_view_items.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="260dp"
android:layout_marginLeft="8dp"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="name"
android:id="#+id/name"
android:textStyle="bold"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="designation"
android:id="#+id/desig"
android:textStyle="bold"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="salary"
android:id="#+id/salary"
android:textStyle="bold"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_marginLeft="70dp">
<CheckBox
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/checkBox"
android:layout_weight="1" />
</LinearLayout>
</LinearLayout>
//activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.prematix.ashok.friday_9.MainActivity">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:hint="Name"
android:ems="10"
android:id="#+id/ed_name" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:hint="Designation"
android:ems="10"
android:id="#+id/ed_desig" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:hint="Salary"
android:ems="10"
android:id="#+id/ed_salary" />
<Button
android:text="Save"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/save" />
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/mylist"/>
</LinearLayout>

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